this.nodes is not a function

[pankajashankar]

Hi, Premise:

1. I have a angular 7 custom component library xyz-component. Within the library in one of the child component I use jsonpath which I installed with npm install jsonpath and the version of 1.0.1 got installed which I verified in the package.json.
2. I built the xyz-component library with npm_pack and a xyz-component.0.0.1.tgz is created.
3. I deploy the tgz file with npm install in my consuming project for e.g. consumingmain-portal everything goes fine.
4. Did a npm install of jsonpath in the consuming project as well
5. When I try to run the consuming application - with ng serve I get the error _node_modules\jsonpath\lib\index.js change all references to'this' to JSONPath.prototype - resolve ‘ this.nodes is not a function’ issue. Note: change is in node_modules of consuming project__

Not sure why it gives that error but when I modify the index.js under nodemodules\jsonpath to change this to JSONPath.prototype, and re-run I do not get the error.

Please let me know what is the issue here. Also mainly what is the solution.

--Thanks

[elmpp]

think the answer to this is to follow the docs exactly:

// https://github.com/dchester/jsonpath#jpqueryobj-pathexpression-count

import jp from 'jsonpath'
jp.query(BLAH)

If you destructure the import (as i was):

import {query} from 'jsonpath'
query(BLAH)

It gives the error you describe. I'd say it was down to webpack treeshaking or something but declaring as an external didn't help either..

[guoliang]

in my case I have to import jsonpath in the following way

const jsonpath = require("jsonpath")

[danbars]

I had the same issue because I was calling : jp.query.call(null, data, path) When I changed this parameter from null to jp it solved the problem. jp.query.call(jp, data, path)

btw, my import is import jp from 'jsonpath'

[guoliang]

I had the same issue because I was calling : jp.query.call(null, data, path) When I changed this parameter from null to jp it solved the problem. jp.query.call(jp, data, path)

btw, my import is import jp from 'jsonpath'

belated update from my initial post. I did that change recently also and got it to work. so in conclusion it seems like importing individual function does not work, instead you have to import the entire content.

[LRagji]

I think this needs to be fixed so that tree shaking can be done to only use functions that are required..